11591999 has 4 divisors (see below), whose sum is σ = 11603664. Its totient is φ = 11580336.

The previous prime is 11591953. The next prime is 11592043. The reversal of 11591999 is 99919511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11591999 - 2¹² = 11587903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11591299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4187 + ... + 6380.

It is an arithmetic number, because the mean of its divisors is an integer number (2900916).

Almost surely, 2^11591999 is an apocalyptic number.

11591999 is a deficient number, since it is larger than the sum of its proper divisors (11665).

11591999 is a wasteful number, since it uses less digits than its factorization.

11591999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11664.

The product of its digits is 32805, while the sum is 44.

The square root of 11591999 is about 3404.7024833310. The cubic root of 11591999 is about 226.3181815817.

The spelling of 11591999 in words is "eleven million, five hundred ninety-one thousand, nine hundred ninety-nine".